MG MGB User Manual

THE
FUEL
SYSTEM
D
Reassembling
PEDESTAL
AND
ROCKER
NOTE—The
steel pin
which
secures
the
rocker
mechanism
to
the
pedestal
is
specially
hardened
and
must
not
be
replaced
by other
than
a
genuine
S.U.
part.
1.
Invert
the
pedestal
and
■t the
rocker
assembly
to
it
by
pushing
the
steel
pin
through
the
small
holes
in
the
rockers
and
pedestal
struts.
Then position
the
centre
toggle
so
that
with the inner
rocker
spindle
in
tension
against
the
rear
of the
contact
point
the
centre
toggle
spring is
above
the
spindle
on
which the white
rollers
run.
This positioning
is
important
to
obtain
the
correct
‘throw-over’
action.
It
is
also
essential that
the
rockers
are
perfectly
free
to
swing
on
the
pivot pin
and that
the
arms
are
not
binding
on
the
legs
of the
pedestal.
If
necessary,
rockers
can
be
squared
up
with
a
pair
of
thin-nosed pliers.
2.
Assemble
the
square-headed
2
B.A.
terminal
stud
to
the
pedestal,
the
back
of
which
is
recessed
to
take
the
square
head.
3.
Assemble
the 2
B.A.
spring
washer
and
put
the
terminal
stud
through
the
2
B.A.
terminal
tag
then
■t
the lead
washer,
and the
coned
nut
with
its
coned
face
to
the
lead
washer
(this
makes better
contact
than
an
ordinary
■at
washer
and
nut). Tighten
the
2
B.A.
nut
and
■nally
add
the
end
cover
seal
washer.
4.
Assemble
the
pedestal
to
the
coil
housing by
■tting
the
two
B.A.
pedestal
screws,
ensuring
that
the
condenser wire
clip
on
the
left-hand
screw
(9
o’clock
position)
is
between
the
pedestal
and the
earthing
tag.
The spring
washer
is
not
fitted when
a
condenser is
used.
5.
Tighten
the
screws,
taking
care
to
prevent
the
earthing
tag
from turning
as
this will
strain
or
break the
earthing
■ex.
Do
not
overtighten
the
screws
or
the
pedestal will
crack. Do
not
fit the
contact
blade
at
this
stage.
DIAPHRAGM
ASSEMBLY
6.
Place
the
armature
spring
into
the
coil housing
with
its
large
diameter
towards
the coil.
A.93lOB
Fig.
D.3
Setting
the
correct
relative
position
of blade and
rocker
contact
points
MGB.
Issue4.
15676
10.
ll.
12.
Fig. D.4
Fitting
the
armature
guide
plate.
(Inset),
levering
one
of the
end
lobes
from the
recess
Before
■tting the diaphragm
make
sure
that the
impact
washer
(a small
neoprene
washer that
■ts
in
the
armature
recess)
is
fitted
to
the
armature.
Do
not
use
jointing
compound
or
dope
on
the
diaphragm.
Fit the
diaphragm by
inserting
the
spindle
in
the
coil
and
screwing
it
onto
the
threaded
trunnion
in
the
centre
of the
rocker assembly.
Screw in
the
diaphragm
until the rocker
will
not
‘throw over’.
This
must
not
be
confued with
jamming
the
armature
on
the
coil housing
internal
steps.
ROLLER TYPE.
With the
pump
held
with the rocker
end
downwards,
turn
back the edge
of the
diaphragm
and
■t
the 11
brass
rollers
into
the
recess
in
the coil
housing.
0n later-type
rocker mechanisms
with
adjustable
fingers
fit the
contact
blade and adjust
the finger
settings
as
described under
those
headings, then
carefully
remove
the
contact
blade.
With the
pump
held
horizontally, slowly
unscrew
the
diaphragm while
at
the
same
time
actuating
it,
until
the rocker just
throws
over.
Unscrew
the
diaphragm
until the
holes
are
aligned,
then
unscrew
it
a
further
quarter
of
a
turn
(four
holes).
ROLLER
TYPE. Press the
centre
of the
armature
and
fit the
retaining
fork
at
the
back
of the
rocker
assembly.
BODY
COMPONENTS
(type
AUF
300)
13.
14.
GUIDE
PLATE
TYPE. Turn
back the
edge
of the
diaphragm
and
insert
one
end lobe
of the
armature
guide plate
into
the
recess
between
the
armature
and
the
coil housing.
Progressively
position
all
four
lobes,
then commencing
in
the
centre
and
■nishing with the
two
end
ones, press
the
lobes
■rmly
into
the
recess.
Note
that
the inlet
valve
recess
in
the body
is
deeper
than
the outlet
recess
to
allow
for the
■lter and
extra
washer. Screw
in
the
inlet
and
outlet
connections
with
their sealing
rings.
Assemble. the
outlet valve
D.5

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English